Dancer Cheryl Burke previously announced she was leaving the show after 18 seasons. Back in December, Entertainment Tonight reported Burke was attached to a new NBC competition series.

Although Burke has been on the show longer, Hough's departure is a bigger game-changer for the show.

Burke won her first two seasons of the show but had since fallen flat with some of her contestants. Last season she placed seventh with her celebrity partner Antonio Sabato Jr. (Video via ABC / "Dancing with the Stars")

Murphy's exit isn't too surprising, though. Back in December, outlets reported the show's producers were looking to make Paula Abdul a permanent judge.

And now it seems leaving wasn't her choice. A spokesperson for Murphy told TVLine the judge wasn't given the option to return for another season.

Still, it doesn't look like these casting shake-ups will hurt the ratings of either show.

"Dancing with the Stars" can do no wrong when it comes to ratings, and around 15.8 million people tuned in to watch its 19th season finale back in November, according to TV by the Numbers.

In comparison, "So You Think You Can Dance" doesn't have stellar ratings: The Wrap reported its last season finale drew 5.7 million viewers. But people don't tune in for Murphy — they tune in for the competition.

But since it airs during the summer when TV ratings usually fall, Fox would really need to come up with a better reality show concept if it wanted to replace the show, which is why its upcoming season will feature a new format with stage and street dancers competing against one another.